Latch-knob door-lock.



No. 857.705. PATBNTED. JUNI'. 25, 1907.

L. w. WOODBURN. LATCH KNOBl DOOR Loox.

APPLIOATION FILED 'JULY s1, 1905.

"Mau

perspective.

UNITED STA'glE-S PATENT OFFICE.

Specification of Letters Patent.

Patented June 25, 1907'.

Application filed July 3l, 1905. Serial No. 272,055.

To @ZZ whom, t may concern:

Be it known that I, LEwis W. WooDBURN, a citizen of the U new and useful Improvements in Latch-Knob Door-Locks; and I do hereby declare the following to be a l, clear, and exact description of form a part of this specification.

This invention relates to new and useful improvements in latch knob door-locks, and

' and efficient means where- YOp the latch is being actuated.

The invention comprises various details of construction, combinations ,and arrang ments of parts which will be hereinafter fully described and then specifically defined in the appended claims.

he invention is illustrated in the accompanying drawings, which, with the letters of reference marked thereon, form a part of this application, and in which drawings similar letters of reference indicate like parts in the views, in which Figure l is a side elevation of lock with one of the side plates of the casing removed showing locking bolt retracted. Fig. 2 is a side elevation with bolt in locked position. Fig. 3 is a perspective view of the lock mechanism. igs. 4 and 5 are details in efereiice now being had to the details of the drawings by letter, A designates a door, having a mortised edge for the reception of a casing B, the outer edge of said casing having for the reception of the latch O, which has a yoke O fastened thereto, the rear end of said yoke having angled arms O2 against which the arms of the roll-back D -are adapted to bear. Suitable guide arms O project from the casin r of the lock, and are adapted to guide the arms of the yoke as the same may be actuated by the knob shaft. Said roll-back D has an angular outlined aperture therein, which is adapted to receive the knob shaft E, which passes through apertures in the casing ofthe lock and has knobs my improved j secured thereto. Said latch O has its outer free end cut away, forming an inclined edge c, which is adapted to contact with a stop I upon the jamb of the door, said stop having inclined surface j the raising' of the latch when the door closes.

designates a bolt which has a recess G j formed in the lower edge thereof and also an inverted V-shaped outlined recess O. The upper edge of said bolt has a lug F which x rises from the edge thereof and H designates a plate mounted upon a pivot I and is provided with a forwardly projecting portion H illustrated clearly in Fig. 4 of the drawings and to which is fastened the lower end of a member C4 made of a material which will allow of its being elongated longitudinally, the upper end of which member is fastened to a pin J mounted in a recess O3 formed in the latc i O. Y

I designates a bar which is fixed to the side of the plate H and overhangs the bolt F.

2 indicates a lug projecting at right angles from the plate H adjacent to the upper edge thereof and is adapted to form an abutment for the lug F when positioned upon one side or the other of the latter to prevent the bolt from longitudinal movement.

ising from the lower portion of the casing is a finger O which extends into the recess G and is adapted to form a sto against the opposite edges of which the endls) of the recess are adapted to contact to limit the longitudinal movements of the bolt F in one direc.- tion or the other.

In operation, when it is desired to lock or unlock the bolt, the key is inserted in the keyhole and the tongue of the key coming in contact with the under edge of the late H, the latter is caused to tilt and the aterally projecting lug H2 thereon will be thrown out of the path of the lug F', thus allowing the to move longitudinally as of the key comes in contact with one or the V-sliaped slot O.

After the lug F has passed by the lateral projection H2, the spring which is put slightly under tension by the tiltin of the plate H and assisted b the weighte end of the plate will cause the latter to tilt back in its normal position with the lug H2 positioned upon the I opposite side of the lug F', thereby locking the bolt at the limit of its throw in one direction or the other. It will be noted also that, as the latch O is drawn within the casin under the tension of the spring O4, the pug the tongue IOO IIO

upon the spring will have a tendency to hold j the plate H with its lateral projection H2 in a locked relation either upon one side or the other of the lug F.

Having thus fully described my what l claim as new and desire to Letters Patent, is

ln combination with a latch and casing therefor, a knob shaft, and rocking member mounted thereon and adapted Jfor actuating said latch, means within the casing for guiding said latch from longitudinal movement, a longitudinal movable bolt, the under edge of j the same being provided with recesses, one j of which has inclined edges adapted to be l' engaged by the bit of a key, a projection upon the casing, a projection extending into the invention, secure by other recess adapted to limit the throw of the bolt in one direction or the other, a lug projecting from the upper edge oi the bolt, a tilting plate mounted within the casing an provided with a lateral extension adapted to contact with one edge or the other of said lug upon the bolt to hold the latter Jroin longitudinal movement in one direction or the other, and an elastic member connecting said plate and latch, as set forth.

In testimony whereof l hereunto aHiX my signature in the presence of two witnesses.

LEWS WV. WOODBURN.

Vitnesses:

CHARLES C. DIGBY, L. P. KELLEY. 

